1/2 head garlic
4 small eggplant
2 to 3 tablespoons olive oil
1 medium onion, peeled and finely chopped
1 yellow or red bell pepper, cored, seeded, and cut into 1/4-inch dice
1 teaspoon salt
1/2 teaspoon freshly ground black pepper
3/4 cup uncooked couscous
1 tablespoon freshly grated lemon zest (2 lemons), finely chopped
1/4 cup low-fat ricotta cheese
1/4 cup roughly chopped fresh flat-leaf parsley, plus more for garnish
1/2 pound red and yellow cherry tomatoes, cut into eighths